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Note 5 - Derivative Instruments and Hedging Activities - Movement in AOCI Balance (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
AOCI balance	$ 204,763		$ 99,154
AOCI balance	330,106		330,106
AOCI balance, Gains and losses on cash flow hedges	321,248		155,560
AOCI balance, Tax impact	(116,485)		(56,406)
Other comprehensive income (loss) before reclassifications, Gains and losses on cash flow hedges	223,983		516,154
Other comprehensive income (loss) before reclassifications, Tax impact	(81,215)		(187,157)
Other comprehensive income (loss) before reclassifications	142,768	$ 27,264	328,997	$ 575,227
Amount reclassified from accumulated other comprehensive income, Gains and losses on cash flow hedges	(27,337)		(153,820)
Amount reclassified from accumulated other comprehensive income, Tax impact	9,912		55,775
Amount reclassified from accumulated other comprehensive income	(17,425)	$ 79,367	(98,045)	$ 414,924
Other comprehensive income (loss), Gains and losses on cash flow hedges	196,646		362,334
Other comprehensive income (loss), Tax impact	(71,303)		(131,382)
Other comprehensive income (loss)	125,343		230,952
AOCI balance, Gains and losses on cash flow hedges	517,894		517,894
AOCI balance, Tax impact	$ (187,788)		$ (187,788)

X

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, tax expense (benefit). Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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